An issue impacting a minimal number of Crosman DPMS SBR Full-Auto BB Air Rifles is that the green seal is installed backward at the factory. At first, the gun will appear to work normally, but it will no longer operate once the CO2 pressure drops (usually after the first magazine is expended).
The good news is that this is a straightforward fix you can do at home, and to help, we have provided this quick tutorial video.
Video:
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